PLANET EARTH

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"Most human beings have an almost infinite capacity for taking things for granted."

Physics

How can a train float in the air? »
                 Some experimental trains ...
What is an electromagnet? »
                    ...
What are magnets made of? »
                 Permanent magnets are ...
Magnetic motors »
                 One of the most ...
How does a compass work? »
               The magnetized needle of a compass ...

Chemistry

Natural Properties»
  What are acids?               ...
Natural Properties»
  Why does my breath ‘steam’ in cold weather?       ...
Natural Properties»
What happens when a liquid boils?               ...
What are plastics? »
                 Plastics are ...
Can metals float in water? »
                   Some very ...

Biology

What makes the snow leopard an endangered animal? »
               A snow leopard is a large cat that ...
Why is the sei whale an endangered animal? »
            The sei whale is one of the fastest whales in the ...
Why the Grevy’s zebra is considered an endangered animal?»
            The Grevy’s zebra is an important member of the ...
What makes the giant otter rare? »
               The giant otter is a carnivorous ...
Why the Rothschild’s giraffe is considered an endangered animal? »
            The Rothschild’s giraffe is a subspecies of ...